Plate for multigraph machines



March 15, 1927. E. PREISLER 1,621,271

PLATE FOR MULTIGRAPH MACHINES ,Filed Deo. s, 1925 Patented Mar. 15, 1927.

nniisrzrR-EISLER, ons-r. t0n-is; Missonaliessieivoa To 'rnee'nnssjivn ELECTRO- -g rrriive co., oF sr. Lo-Urs, ivr'issonar, "aceiar-foitarionor ivrrssoniar PLATE "Een rrnnrieneririviaciiirms] Y Application 'filed December y My inveiitionrelates to improvements in plat-es for inultigiapli machines, and has'fo'r its primary Vobject an electrotype plate prov'idedivith lugs Wliereby'the same can be secured to thedrum `Without the necessity of providing any margin forsecuring the saine vin position, either means of marginal bands or line-lock clips. 1 f' y.further object? is to construct an electrotype plate forl use on Vmultigraph ma- I chines and after the saine has been completed to curve the' saine and then 'secure to the back 'face thereof one or more lugs by means ot which the same can 'be secured to the drum of a multigrapli `machine Withouttlie use of any extraneous fastening devices.

A still further Objectis to construct alng forsecuring electrotype vplates to the drum ofy a niultigiaph machine, which ai'e soV shaped andivhich have sufcient resiliency to firmly secure the plate to the drum and prevent any'horizontal or vertical Vmotion thereby eliminating lthe necessity of 'any ex- Y traneous yfastening means.

Another obj ect is the'niethodfof preparing a multigraph plate so that the same can be `readily appliedy and secured 'to the drum of a Y multigrapli machine in' such manner that Fig. 3 is an edge view of the same showing the curve to fit the plate in dotted lines;

Fig. 4L isa rear view of the plate prepared 'to receive the lugs;

Fig. 5 is an edge vien7 of thesaine;

Fig. 6 is an enlarged end view of thepreferred form of lug; Y

Fig. 7 yis an end view of a of lug; and f 1 Y l i Fig. 8 is an enlarged view of another modified form'of lug. Y

In the construe-tion of myv device, '9 represents the drum or segment of a lmultigrapli machine. This drum is provided Wit-h a plurality of ribs 10, which are provided with heads 11 so' as to form a plurality of T- shaped'oliannels l2. These channels preterably extend longitudinally of the drum `almodified form lbers 25 and 26 which eachother. t

sp1-925. ysemi No. 72,926.

though they. ,eittendlaterally when a coniplete cylindrical drum` is not used."1 My improvement consists of a plate ,13,1 prefer- A' ably anelectrotype ivhich iscomposed of materialwliich Ican befbent to any, shape and retain `this form.v This material ispreferably lead, itv being essentialthat the material from which the plate'is made isiiotspringy so that, no matter into which shape-'it' has @een bent, itwillretain that fforniwithout any tendency to return to itsforiginal shape.

' -On one face ofthis plateis formed the matter which is to be print-ed7 the othe-rfa-ce being perfectly Hat. After; the.` plate has been tliusformed it is curved b z` l-assin-Oit through curving rollers when it will assume` the shape in crosssection as shown in Fig. 5.v v.'lfhis-curvature'is suchthatr the face 1 4 Aof the plate Will snugly fit the outer` periphery of the drumfor segment-9 `While theface ,l has the printed matter` thereon. By first "castingv the plate 1'8- flatand then curving it to vt the drum,vv there will be `no distortion of Y the: printed matter Whenfthe same appears on a printedrshee't norjvilljthere be any "possibility of the Vtype or the, raised portions of the plate pressing harder `on one port-ion of the ysheet than on theotlier. f In',

' other Words, I get what ist virtually a perfect impression vWithout anydistOrtiOnor( undue pressureV on `certain parts. Afterthe .plate4 has been formed,-as*illustratedinFigs. 4

and 5, I cutaseries of square: recesseslfin the face-14;... These .recesses areonlyofs'ucli depth1 that thefbase-fl? ot 4vthe Vlugs `,vv-ill fit therein and when secured inr position, as. LWill 4hereinafter be described, will forma conti# nuity of the surfacelll sothatthis surface Willbe the true are of Vay circle Without any depressions or projections. The lugVA is formed preferably of a single piece of sheet metal and is provided with avholloW head 18, l ,Y y

a web 19,' and the base 17. 1

In Fig. Z I have shown a modified form of my devicel in Which a U-'shaped liead .'20 is employed. t vThe Web 21 being lof the The method Vof constructinga plate according to my improvements kis as follows:

The electrotype or plate is first made yor cast y are" VY separated .from

fiat vas illustrated in Figs. 2 .and 3Y after which Vit is passed through forming rollers. 'The face 14, Which is smooth, is designed to be the innerperiphery of the arc vin Which the' plate isbent While the face 15carries.

the type or irregular surface which is dei signed to do the printing.` After the plate has been thus bent, the square cut recesses lfarc cut in the surface 14 by means of a saw or milling cutter, the depth of these f recesses, however, being exactly the same as the thicknessrof` the 'metal out ofWhich the lugs are p' made. The lugs are then cut the vsame length as the plate and set in position in the recesses 16 after which they are secured thereto by any ivell'known means, such as a soldering iron or .by means `of burning therein as is done in storage batteries.

Tliefplate When thus assembled With'V the lugs is ready to be placed in position and this is done by inserting the plate into the segment or drum so that the head ofthe lugs will enter the T slot l2. When in this position the sides 27 ofthe head will con tact with the Walls 28 of the T slots 12 While the shoulders 29 Will contact With the shoulders 30v of lthe T slots thus preventing any radial movement or circumferential movement .of the lugs, andvby reason of the c lugs vbeing formed of relatively thin metal a certain amount of friction or rather spring action isset up in` the lugs, Which Will prevent their longitudinal movement, Vthus firmly holding Vthe plate in positionl Without the use of bands or clips asafore mentioned. I Wish it, to be understood that I do not'rely upon any resilient action of the lug to hold thesame in position on the plate,

the securing of the lug to the plate being entirely accomplished by Welding,- soldering or' similar means, the only resilient action being in the head when the device is appliedto the drumor segment.,`

It Willbe 4observed that according to my method of forming the plates, thatgis byk Y forming a very shallovvsquarerecess, then inserting in saidrecess the base ofv said lug and then soldering over, that the plate is in no sense weakened.

Having fullyA described Y my invention, what I claim 1s 1.-'- 1 l. A plate for multigraph machines coinprising a curved plate having a printing surface on its outer face, parallel square recesses formed on the inner face of said plate, and a sheet metal vlugy having a resilient hollou7 head secured in each of saidfrecesses extendf ing the full length of the plate. y

2.y In a plate formultigraph machines a curved plate having a printing surface ,on

its outer face and a smoothjinner face, a square recess formedfinthe inner face of said plate, and a lug formed of sheet metaly havinga hollow resilient head, a baseand a web secured to said plate in said recess and extending the full length of said plate, the

depth of saidrecess being the same as the thickness of the sheet metal in said base.

3. A plate for multigraph machines comprising a curved plate having a printing surface on'its outer periphery, a sheet metal ing a plate having` a printing surface, passing said plate through `curving rollers so that it Will conform to the drum of a multi` graphmachine, cutting al recess in the inner face of saidy plate, setting a lug in said recess,

and lastly securingsaid lug in said recess by means of soldering or Welding whereby ysaid lug is vattached Without' disturbing the printing surface kof the plate.

' ERNsr 'PnnIsLER.'

In testimony whereofV I have afIiXed iny signature. 

